Public bug reported:

This issue could be reproduced at 6.8.0-50-generic and 6.8.0-51-generic,
I could not reproduce it at 6.8.0-49-generic kernel.

On -50 or -51, there is a new card generated from simple-framebuffer.0.

lrwxrwxrwx  1 root root    0 Dec 23 15:16 card0 -> 
../../devices/platform/simple-framebuffer.0/drm/card0/
lrwxrwxrwx  1 root root    0 Dec 23 15:16 card0-Unknown-1 -> 
../../devices/platform/simple-framebuffer.0/drm/card0/card0-Unknown-1/

From xrandr, there 'None-1 connected' display, when I open a terminal, I
could not find it on desktop, and I found it showed at 'Nono-1' display.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "50.cards.log"
   
https://bugs.launchpad.net/bugs/2092387/+attachment/5847065/+files/50.cards.log

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https://bugs.launchpad.net/bugs/2092387

Title:
  A simple-frambuffer.0 Unknown card shows 'None-1 connected' at kernel
  6.8.0-50

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